Why is a woodpecker without a beak called a head banger?

What does an hawaian goose eat? Are swallows nests protected? Why are insect wings and bird wings similar? Are ivory-billed woodpeckers nocturnal? What is is collective noun for birds? Do kiwi birds have kiwifruit inside their body? Do downy woodpeckers hunt in groups or by itself? Do birds and insects share any structural similarities that would suggest they are closely related taxonomiclly? What is the difference between red tailed hawks and broad wing hawks? How do royal penguins incubate their young? How much would a dove cost? How old should a love bird be before you clip its wings? What will eat an egret? Does a lion eat a parrot? What is a spotted bats wing spand? What do pelicans use there long wings for? Who eats penguin? What is red windmill in french? Is ivory and eggshell the same color? Why do bird move their neck often?